Omron Programmable Terminals NT631 Setup Manual page 273

Dimensions
Mounting Dimensions
POWER
RUN
256
15.5 (0.61)
240 (9.45)
324 (12.76)
Appendix B
Mounting panel
Mounting fixture
140 (5.51)
7.5 (0.30)
34
(1.34) (min.)
38 (1.5) (max.)
Units: mm (inch)
259 (10.20)